Agent Browser Shield: Free OpenClaw Extension Blocks Prompt Injection & Dark Patterns
PixieBrix has released Agent Browser Shield, a free, source-available browser extension that sits between OpenClaw and the browser to protect AI agents from adversarial content.
What It Blocks
- Prompt injection — both visible and hidden instructions embedded in page content
- Dark patterns — UI elements designed to manipulate or coerce agent behavior
- Context pollution — low-value junk that degrades instruction following
Bonus: stripping irrelevant content reduces token consumption, making runs both more secure and cheaper.
Background
PixieBrix previously built insider-risk and social-engineering protection for BPO contact centers. Agent Browser Shield applies the same methodology to agentic browsing via OpenClaw.
The team acknowledges this is not a solved problem and is building the shield in the open, sharing benchmarks as they go. They invite community contributions to help prioritize rules.
Installation
Install alongside your OpenClaw setup from either:
- ClawHub: https://clawhub.ai/pixiebrix/agent-browser-shield
- GitHub: https://github.com/pixiebrix/agent-browser-shield
Give it a star and report weird agent behaviors you've encountered to help shape the ruleset.
📖 Read the full source: r/openclaw
👀 See Also
Mneme: A Free, Local-First Claude Chat Client with Persistent Memory
Mneme is a free, open-source, local-first Claude chat client with tiered memory, entity tracking, daily summaries, and support for Sonnet 4.5 via the Anthropic API.
Claudetop: Real-Time Cost Monitoring for Claude Code Sessions
Claudetop is an htop-like tool that shows real-time spending, cache efficiency, and model comparisons for Claude Code sessions. It provides slash commands like /claudetop:stats and smart alerts for cost milestones and efficiency issues.
iai-mcp: Local daemon gives Claude persistent memory across sessions with 99% recall
iai-mcp is an open-source local daemon that captures every Claude conversation, organizes it into three memory tiers, and feeds context back on new sessions. Achieves >99% verbatim recall, retrieval under 100ms, and session-start cost under 3,000 tokens.
log-context-mcp: MCP tool reduces log token usage by 96% for Claude debugging
log-context-mcp is an MCP tool that preprocesses log files before they reach Claude's context, deduplicating lines, grouping stack traces, and stripping noise to reduce token usage. Testing on a 2000-line Apache log showed 96.5% reduction while correctly identifying root causes.